Rapacity's Upper Limit
A predator that feeds on eagles and lions needs a home the size of all of Scotland. Just as Macbeth and the "pull of the shadow king" that he murdered need an underworld spanning Scotland to Gibraltar. This space requirement comprises predator size within evolution's limits.

Stages of Life
There are four stages from plankton to killer whale. The stage from the whale to the massive whaling ship under Japanese construction generates no additional biological facts, the analyst T. Sachse says, unless one considers the greedy mouths of the whale eater and the filler pipes of the machines by which whale oil is rendered supple and as an appropriate cleaning agent (or the interaction between Greenpeace and the whalers), as a stage of life.